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+#!/usr/bin/env python3
+
+# Challenge 065
+#
+# TASK #1 > Digits Sum
+# Submitted by: Mohammad S Anwar
+# Reviewed by: Ryan Thompson
+#
+# You are given two positive numbers $N and $S.
+#
+# Write a script to list all positive numbers having exactly $N digits where sum
+# of all digits equals to $S.
+#
+# Example
+# Input:
+#     $N = 2
+#     $S = 4
+#
+# Output:
+#     13, 22, 31, 40
+
+import sys
+from itertools import product
+
+def digits_sum(N, S):
+    out = []
+    for n in range(10**(N-1), 10**N):
+        if sum(int(d) for d in str(n)) == S:
+            out.append(n)
+    return out
+
+N, S = map(int, sys.argv[1:])
+out = digits_sum(N, S)
+print(", ".join(map(str, out)))